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How to cut down a fork steerer tube

Setting up a new fork? This video will help

Unsure how to cut down a fork steerer tube? Check out our walkthrough video to find out how

Whether you’re setting up a brand new fork or just want to get rid of a spacer stack, cutting down a steerer tube isn’t as tricky as you might think. As long as you have the right tools and are very, very careful, that is.

That said, new forks will need to be fitted with a crown race before installation, which requires specific and expensive tools and is best dealt with by your local bike shop.

This process will work for aluminium and carbon steerers on both road and mountain bikes, so watch the video here to see James Tennant talk you through it.

How to cut down a fork steerer tube

You will need

A saw fitted with the appropriate blade for your steerer tube material

Saw guide

Degreaser

Paper cloth

File/sandpaper

A small flathead screwdriver

Step 1. Remove and mark

Remove the wheel from the bike and detach your brake caliper and hose from the fork. This process varies depending on whether you have rim or disc brakes, but will usually only involve one or two hex bolts.

Undo the stem top-cap with a hex key (usually 4 or 5mm) and remove any spacers you have above the stem.

While doing this, take note of the parts you have removed and the order they were arranged in — you will need to re-assemble them in the same way.

Take a small flathead screwdriver and use it to score the steerer tube, as close to the top of the stem as you can

Take a small flathead screwdriver and use it to score the steerer tube, as close to the top of the stem as you can. You’ll be basing your cutting point on this mark, so you need to be sure you want your stem at this height, or lower.

Undo the stem mounting bolts, remove the stem from the tube and rest the bars gently on the cables

Remove any remaining spacers and headset washers, again, taking note of the order you remove them.

You should now be able to tap out the fork.

Step 2. Measure and cut

Place the saw guide onto the steerer tube with the clamp side closest to the fork leg. Using a loose spacer as a guide, carefully score a second line into your steerer, about 3mm below the first. This is the line you will cut along.

Place the saw guide onto the steerer tube with the clamp side closest to the fork leg